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1 //===- InputSection.h -------------------------------------------*- C++ -*-===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #ifndef LLD_MACHO_INPUT_SECTION_H
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10 #define LLD_MACHO_INPUT_SECTION_H
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11
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12 #include "Config.h"
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13 #include "Relocations.h"
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14
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15 #include "lld/Common/LLVM.h"
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16 #include "llvm/ADT/ArrayRef.h"
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17 #include "llvm/BinaryFormat/MachO.h"
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18
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19 namespace lld {
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20 namespace macho {
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21
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22 class InputFile;
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23 class OutputSection;
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24
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25 class InputSection {
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26 public:
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27 virtual ~InputSection() = default;
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28 virtual uint64_t getSize() const { return data.size(); }
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29 uint64_t getFileSize() const;
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30 uint64_t getFileOffset() const;
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31 uint64_t getVA() const;
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32
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33 void writeTo(uint8_t *buf);
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34
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35 InputFile *file = nullptr;
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36 StringRef name;
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37 StringRef segname;
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38
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39 OutputSection *parent = nullptr;
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40 uint64_t outSecOff = 0;
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41 uint64_t outSecFileOff = 0;
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42
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43 uint32_t align = 1;
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44 uint32_t flags = 0;
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45 uint32_t callSiteCount = 0;
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46 bool isFinal = false; // is address assigned?
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47
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48 // How many symbols refer to this InputSection.
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49 uint32_t numRefs = 0;
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50
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51 // With subsections_via_symbols, most symbols have their own InputSection,
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52 // and for weak symbols (e.g. from inline functions), only the
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53 // InputSection from one translation unit will make it to the output,
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54 // while all copies in other translation units are coalesced into the
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55 // first and not copied to the output.
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56 bool wasCoalesced = false;
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57
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58 bool isCoalescedWeak() const { return wasCoalesced && numRefs == 0; }
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59 bool shouldOmitFromOutput() const { return !live || isCoalescedWeak(); }
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60
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61 bool live = !config->deadStrip;
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62
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63 ArrayRef<uint8_t> data;
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64 std::vector<Reloc> relocs;
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65 };
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66
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67 inline uint8_t sectionType(uint32_t flags) {
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68 return flags & llvm::MachO::SECTION_TYPE;
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69 }
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70
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71 inline bool isZeroFill(uint32_t flags) {
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72 return llvm::MachO::isVirtualSection(sectionType(flags));
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73 }
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74
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75 inline bool isThreadLocalVariables(uint32_t flags) {
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76 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_VARIABLES;
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77 }
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78
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79 // These sections contain the data for initializing thread-local variables.
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80 inline bool isThreadLocalData(uint32_t flags) {
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81 return sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_REGULAR ||
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82 sectionType(flags) == llvm::MachO::S_THREAD_LOCAL_ZEROFILL;
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83 }
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84
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85 inline bool isDebugSection(uint32_t flags) {
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86 return (flags & llvm::MachO::SECTION_ATTRIBUTES_USR) ==
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87 llvm::MachO::S_ATTR_DEBUG;
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88 }
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89
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90 bool isCodeSection(const InputSection *);
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91
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92 extern std::vector<InputSection *> inputSections;
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93
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94 namespace section_names {
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95
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96 constexpr const char authGot[] = "__auth_got";
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97 constexpr const char authPtr[] = "__auth_ptr";
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98 constexpr const char binding[] = "__binding";
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99 constexpr const char bitcodeBundle[] = "__bundle";
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100 constexpr const char cfString[] = "__cfstring";
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101 constexpr const char codeSignature[] = "__code_signature";
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102 constexpr const char common[] = "__common";
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103 constexpr const char compactUnwind[] = "__compact_unwind";
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104 constexpr const char data[] = "__data";
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105 constexpr const char debugAbbrev[] = "__debug_abbrev";
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106 constexpr const char debugInfo[] = "__debug_info";
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107 constexpr const char debugStr[] = "__debug_str";
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108 constexpr const char ehFrame[] = "__eh_frame";
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109 constexpr const char export_[] = "__export";
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110 constexpr const char functionStarts[] = "__func_starts";
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111 constexpr const char got[] = "__got";
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112 constexpr const char header[] = "__mach_header";
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113 constexpr const char indirectSymbolTable[] = "__ind_sym_tab";
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114 constexpr const char const_[] = "__const";
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115 constexpr const char lazySymbolPtr[] = "__la_symbol_ptr";
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116 constexpr const char lazyBinding[] = "__lazy_binding";
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117 constexpr const char moduleInitFunc[] = "__mod_init_func";
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118 constexpr const char moduleTermFunc[] = "__mod_term_func";
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119 constexpr const char nonLazySymbolPtr[] = "__nl_symbol_ptr";
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120 constexpr const char objcCatList[] = "__objc_catlist";
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121 constexpr const char objcClassList[] = "__objc_classlist";
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122 constexpr const char objcConst[] = "__objc_const";
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123 constexpr const char objcImageInfo[] = "__objc_imageinfo";
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124 constexpr const char objcNonLazyCatList[] = "__objc_nlcatlist";
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125 constexpr const char objcNonLazyClassList[] = "__objc_nlclslist";
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126 constexpr const char objcProtoList[] = "__objc_protolist";
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127 constexpr const char pageZero[] = "__pagezero";
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128 constexpr const char pointers[] = "__pointers";
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129 constexpr const char rebase[] = "__rebase";
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130 constexpr const char staticInit[] = "__StaticInit";
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131 constexpr const char stringTable[] = "__string_table";
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132 constexpr const char stubHelper[] = "__stub_helper";
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133 constexpr const char stubs[] = "__stubs";
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134 constexpr const char swift[] = "__swift";
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135 constexpr const char symbolTable[] = "__symbol_table";
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136 constexpr const char textCoalNt[] = "__textcoal_nt";
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137 constexpr const char text[] = "__text";
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138 constexpr const char threadPtrs[] = "__thread_ptrs";
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139 constexpr const char threadVars[] = "__thread_vars";
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140 constexpr const char unwindInfo[] = "__unwind_info";
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141 constexpr const char weakBinding[] = "__weak_binding";
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142 constexpr const char zeroFill[] = "__zerofill";
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143
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144 } // namespace section_names
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145
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146 } // namespace macho
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207
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147
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148 std::string toString(const macho::InputSection *);
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149
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173
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150 } // namespace lld
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151
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152 #endif
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